Green Polyp Toadstool not growing

[Seguragr]

I apologize in advance for not posting water parameters, I am at work and just now thought about asking for advice. I will try to post some later today but at my last check 2 day ago they were

Ph: 8.3
Temp: 79-80
Nitrate: 0
Nitrite: 0
Phosphate: 0
Ammonia: 0
Sg 1.025

I still have some issues with brown algae, so I imagine that my 0 nitrate reading is a false 0.

Anyway, the real question: I have had a green polyp toadstool in my tank for about four to five months now. It seems healthy in that its polyps are extended and bright green. However, this coral has not grown at all since I got it. I understood these corals to be fairly fast growing, so I am shocked to see that after so much time my toadstool is still less than 1/2 inch diameter.

I got this coral from my LFS. It was part of a big toadstool that looked like it was dropping babies. I got one of the "babies."

I can't for the life of me figure out what would be causing the coral to be open and healthy looking, but to not grow at all.

I dose reef carbonate and complete to maintain calcium and KH and reef plus as a supplement, each twice a week at the levels recommended by my LFS. Everything else is happy.

My monti cap has exploded in size and I have had to frag it. My gsp has gotten probably 20 times bigger and I have fragged it. Even my Duncan has gone from 2 heads to 10 heads with more on the way. Everything seems to be thriving except this one coral.

Any ideas?

 

[Mordoff]

I apologize in advance for not posting water parameters, I am at work and just now thought about asking for advice. I will try to post some later today but at my last check 2 day ago they were

Ph: 8.3
Temp: 79-80
Nitrate: 0
Nitrite: 0
Phosphate: 0
Ammonia: 0
Sg 1.025

I still have some issues with brown algae, so I imagine that my 0 nitrate reading is a false 0.

Anyway, the real question: I have had a green polyp toadstool in my tank for about four to five months now. It seems healthy in that its polyps are extended and bright green. However, this coral has not grown at all since I got it. I understood these corals to be fairly fast growing, so I am shocked to see that after so much time my toadstool is still less than 1/2 inch diameter.

I got this coral from my LFS. It was part of a big toadstool that looked like it was dropping babies. I got one of the "babies."

I can't for the life of me figure out what would be causing the coral to be open and healthy looking, but to not grow at all.

I dose reef carbonate and complete to maintain calcium and KH and reef plus as a supplement, each twice a week at the levels recommended by my LFS. Everything else is happy.

My monti cap has exploded in size and I have had to frag it. My gsp has gotten probably 20 times bigger and I have fragged it. Even my Duncan has gone from 2 heads to 10 heads with more on the way. Everything seems to be thriving except this one coral.

Any ideas?

What kind of flow and lighting does it have?

 

[lgtentacle]

Two things come to mind as possibilities. Either it is putting it's energy into attaching or it is losing tissue faster than it can grow it. If the toadstool is placed in an area that has a large hole in the rock, then it will often try to fix the space to shore up the stalk before putting it's energy into head growth. How often is it shedding? Excessive iodine can cause toadstools to shed to the point where they actually start reducing in size. Usually the excessive shedding problem is fairly obvious though (like shedding once a week).

 

[rgauvin]

What is your alk reading? My GSP extends much farther and grows much faster with a decent to good alk. When it's low, my GSP grows very poorly and barely extends.

 

[trinidiver]

As Mordoff said, What kind of flow and lighting do you have?
I have one thats about 12-14" now and it has had fantastic growth with my Cal @ 460+ & my Alk @ 9+, Mag @ 1440+.
I got it at my LFS about 2" in Aug 2011, . I have it under 12 - HO-T5 bulbs (39W)
8 bulbs are 12000K and 4 are 03 violet and its about 20" from the lights. It loves medium to heavy flow of my MP40's. I'll post some pics of the stages and dates in a bit